Are You Looking For The Best Emergency Locksmith in the City of London, Contact A & G Master Locksmith And Team, We are long-established and fully insured. A & G Master Locksmith, we work with the police and local agencies. Whether you need a new house key or car key, new vehicle transponder, emergency call out after getting locked out of your car or house, repair services, security advice, insurance validation work, door servicing for faulty doors – we can help.